So, rain will occur in some places (such as the western side of the Olympic Mountains) without it showing up on our loop. The beam can be blocked by mountains, and some areas are simply too far away from any radar. The coverage of the Pacific Northwest by weather radar is by no means uniform. If you are looking for high resolution, photographic quality satellite imagery of hurricanes and other storms please visit NOAA's Environmental Visualization Laboratory. A snapshot of the current cloud cover in the Western Hemisphere. Our loop shows the signals recorded by several radars in the northwest over the last several hours. Unless otherwise noted, the images linked from this page are located on servers at the National Headquarters of the National Weather Service. Shows hazardous conditions that could affect your drive. High values of dbz (color scale to the right of the image) indicate large drops and heavy precipitation. Raindrops and snow produce reflections that become stronger as the size of the drop or flake increases. Having all stations plotted on a map guides you as to where high- and low-pressure systems, fronts, and the like are located, which ultimately helps you decide where to draw them in.Weather radars send out pulses of microwave energy and listen between the transmitted pulses for part of that the energy to be reflected back to the radar. But if you'll be analyzing a weather map by hand, station plot data is often the only information you start off with. The NWS, through a variety of sub-organizations, issues different forecasts to users, including the general public. The original data from NCEP is in GRIB (GRIdded Binary or General. If a weather map has already been analyzed, you'll find little use for the station plot data. See the latest Minnesota Doppler radar weather map including areas of rain, snow and ice. The precipitation data are quality-controlled, multi-sensor (radar and rain gauge) precipitation estimates obtained from National Weather Service (NWS) River Forecast Centers (RFCs) and mosaicked by National Centers for Environmental Prediction (NCEP). Sky cover (also as one of NOAA's symbols) Modern weather radars are mostly doppler radars, capable of detecting the motion of rain droplets in addition to intensity of the precipitation.Current weather (marked as one of dozens of symbols established by National Oceanic and Atmospheric Administration or NOAA).Dewpoint temperature (degrees Fahrenheit).Air temperature (in degrees Fahrenheit).They include reports of a variety of weather data at that location: Station plots describe the weather at a station location. (When reading the chart, note whether the time of year is daylight saving time or standard time and read accordingly.)Īs seen here, some surface weather maps include groupings of numbers and symbols known as weather station plots. If you're in California (which is Pacific Coastal Time) and the UTC issue time is "1345Z" (or 1:45 p.m.), then you know that the map was constructed at 5:45 a.m. If you're new to Z time, using a conversion chart (like the one shown above) will help you easily convert between it and your local time. Known as Zulu or Z time, this figure is included on a weather map so that all meteorological weather observations (taken at different locations and therefore, in different time zones) can be reported at the same standardized times no matter what the local time might be. It tells you when the weather map was created and also the time when the weather data in the map is valid. One of the first coded pieces of data you might notice on a weather map is a 4-digit number followed by the letters "Z" or "UTC." Usually found at the map's top or bottom corner, this string of numbers and letters is a timestamp.
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